Not sure what to think AF was due 1/6 and still a no show bfn on all pregnancy test

Af was due 1/6 I’m usually very regular 28 days, it comes like clock work. I am BC, on my last week of pills i started spotting on 12/31 put in a tampon and nothing on it. AF never showed up so i never started my new pack of pills and when i took two First Response tests i get this. I’m not sure what to think at this point, can someone please help me. I have pain like AF is coming but she’s just a no show.